The Catalytic Activity of Co/ZrO2 for NO Reduction with Propane in O2 Presence

The selective catalytic reduction (SCR) of NO by propane in the presence of excess oxygen was studied on a Co/ZrO₂ catalyst. This system is present as active for the NO reduction to N₂. It was found that the addition of Co could improve the activity and selectivity of propane towards NO_x reduction. The activity depends strongly on the space velocity (GHSV) when the system works with low oxygen concentration and it is independent of the space velocity when the system operates with excess oxygen. The water vapor present in the feed produces deactivation in the catalyst as well as in the support.     

Selective Catalytic Reduction of NO by C3H6 over Co/Al2O3 Catalyst with Extremely Low Cobalt Loading

In order to reveal the optimum Co loading, the selective catalytic reduction of NO with C₃H₆ over Co/Al₂O₃ catalyst was studied in a systematic fashion by varying the amount of cobalt oxide. It was found that upon loading a small amount of cobalt oxide (namely 0.5 wt% on a Co metal basis), the combination between Co(II) acetate salt and a high-purity alumina provided an active catalyst in the presence of excess oxygen and water. TPR measurement showed the presence of Co species other than CoAl₂O₄ spinel in the most excellent performance catalyst, from which the active sites should be produced.     

铈对化学镀Co-Ni-P合金工艺的影响

研究了稀土元素铈对化学镀Co-Ni-P合金工艺的影响，在正交试验的基础上分析了镀液组成对沉积速度的影响，综合考察了镀层表面质量及镀层与基体的结合力，结果表明化学镀Co-Ni-P合金的工艺中，当稀土元素铈加入时，镀液的稳定性，沉积速度和镀层质量能明显提高，并由此得出工艺的最佳佳镀液组成和操作条件。     

蓄电池添加剂β-Co(OH)_2合成的新工艺

研究了用连续操作的方式和添加新型辅助试剂氨水的方法合成β- Co( OH) 2 。通过连续加料的湿法合成 ,控制一定的 p H值、反应温度和加料速度 ,可以实现对晶体成核和长大速度的有效控制 ;通过加入微量辅助添加剂氨水可以有效地控制β- Co( OH) 2 的氧化。 XRD分析显示 ,合成出来的产物具有较好的结晶性能。电性能测试显示产品性能符合工业标准。本法适宜于工业化规模生产。     

NO2 formation and its effect on the selective catalytic reduction of NO over Co/ZSM-5

Catalytic performance of Co/ZSM-5 with different metal loadings and of HZSM-5 was compared in the NO + O₂, C₃H₈ + O₂, and NO + C₃H₈ + O₂ reactions. It was found that Co/ZSM-5 catalysts containing only isolated cobalt ions in cationic positions are inactive in NO₂ formation. To achieve appreciable NO conversion in the SCR process over these catalysts higher reaction temperatures are required. These results make it possible to suggest that NO₂ formation is not a prerequisite for the SCR of NO with hydrocarbons over Co/ZSM-5. With increasing Co loading, however, Co/ZSM-5 begins to exhibit activity in NO₂ formation. This is explained by the formation of cobalt oxide particles on the zeolite carrier, which are active in the NO₂ formation. Increase in NO₂ formation strongly enhances catalytic activity in SCR of NO at lower reaction temperatures. Comparison of the C₃H₈ conversion in the C₃H₈ + O₂ and C₃H₈ + O₂ + NO reactions provides evidence that NO₂ activates hydrocarbon molecules resulting in the formation of the reaction intermediates of the SCR process.On leave from N.D. Zelinskii Institute of Organic Chemistry, Leninskii Pr. 47, Moscow, Russia.     

Co负载TiO2/氧化石墨烯纳米复合材料的水热法合成及光催化性能

首先采用改进的Hummers法制得氧化石墨烯(GO)，再利用氧化石墨烯为基体，硫酸钛和氯化钴为前驱体，并通过修饰石墨烯的聚乙烯亚胺(PEI)为交联剂，采用一步水热法成功合成了三维柱状自组装的钴负载TiO2/氧化石墨烯纳米复合材料(Co@/TiO2/PEI/RGO)。通过紫外-可见吸收光谱法、X射线衍射、透射电子显微镜和X射线光电子能谱对复合材料的结构和光电性能进行了表征。在紫外和可见光照条件下，研究了复合材料的光催化降解亚甲基蓝(MB)的性能。结果表明钴负载TiO2/RGO纳米复合材料具有较高的光催化活性，在60min内降解率为99%，可循环至少10次。     

正极材料LiNi_（0.4）Mn_（0.4）Co_（0.2）O_2的制备和性能

采用草酸共沉淀法合成了锂离子正极材料LiNi0.4Mn0.4Co0.2O2。用XRD、SEM和充放电实验对合成产物的结构、形貌和电化学性能进行了表征;用DSC对合成产物在不同充电状态下的热稳定性进行了研究。结果表明,采用草酸共沉淀法合成的正极材料LiNi0.4Mn0.4Co0.2O2具有α-NaFeO2型层状结构,阳离子有序度高,粒度均匀适中,电化学性能良好,首次放电比容量达到158.7 mAh/g,30次循环后放电比容量还有144.8 mAh/g;过充电状态下具有良好的热稳定性。     

基于μC／OS—III的多功能控制器

轨道运输车项目的电控部分要实现人机界面、遥控、避障、电机控制、车辆控制多个子模块功能。多功能控制器在μC／OS-III操作系统上实现人机界面、遥控、车辆控制三种功能,简化了系统设计。通过硬件设计、操作系统移植、驱动编写、软件结构设计、软件编码和调试等过程实现了一种多功能控制器。     

感应熔敷微-纳米碳化钨复合涂层的耐磨性研究

用感应加热熔敷方法在Q235钢表面制备了微-纳米碳化钨复合涂层，并分析了涂层的微观结构、显微硬度及耐磨性。结果表明：涂层的组织主要由镍基固溶体和碳化钨颗粒组成。涂层与基体冶金结合；微-纳米碳化钨涂层的耐磨性比微米碳化钨涂层平均提高0．5倍。     

9SiCr表面激光熔覆合金/20MnSiV磨损性能研究

采用Ni合金和Co合金对9SiCr工具钢表面进行激光熔覆，并将熔覆层与20MnSiV配副在干摩擦和油润滑条件下进行磨损试验。采用扫描电子显微镜对磨损表面形貌进行分析，发现油润滑条件下二者的耐磨性有很大提高，其磨损形式主要是磨粒磨损。Ni合金熔覆层与20MnSiV配副时磨损相对较小。